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Derivative Instruments - Hedged assets and liabilities in fair value (Details) - Designated as hedging instruments
$ in Thousands
Dec. 31, 2023
USD ($)
Derivative Instruments  
Notional amount $ 600,000
Carrying Amount of Hedged Assets / Liabilities 600,339
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of Hedged Assets / Liabilities 339
Mortgage backed securities - Residential agency  
Derivative Instruments  
Notional amount 200,000
Carrying Amount of Hedged Assets / Liabilities 200,241
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of Hedged Assets / Liabilities 241
Amortized cost 323,400
Mortgage Loan Pools  
Derivative Instruments  
Notional amount 400,000
Carrying Amount of Hedged Assets / Liabilities 400,098
Cumulative Fair Value Hedging Adjustment in the Carrying Amount of Hedged Assets / Liabilities 98
Amortized cost $ 687,500